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This article in SSSAJ

  1. Vol. 36 No. 1, p. 179-181
    Received: Dec 16, 1970
    Accepted: Sept 17, 1971

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Microbila Degradation of a Montmorillonite-Dextran Complex1

  1. Alan Olness and
  2. C. E. Clapp2



Microorganisms capable of metabolizing the detran B-512F were isolated from a Webster clay loam soil. Suspension of cells were added to polysaccharide solutions or suspensions of clay-polysaccharide complexes in Warburg respirometers. Oxygen uptake curves, divided into three stages, indicated that the dextran was partially protected in the presence of clay. Rates of oxygen uptake in stage I (1 to 3 hours) were much higher for the systems with dextran alone than for those containing clay-dextran complexes. Rates for stages II (4 to 6 hours) and III (7 to 48 hours) were about equal for systems containing the same amount of dextran. The uptake rate in the first stage indicated a linear relationship to the amount of clay present, while the second stage was related to the amount of dextran initially present.

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